I have to eat something before starting to exercise in the morning, or I get nauseous. (My daughter has that problem, too.) It doesn't have to be much, a banana, small bowl of cereal, couple fig newtons, or something similar works for me.
For your proposed rides, I'd suggest something more substantial, or else you'll be ravenous when you get to work. Pancakes work well for me, but I can't tolerate greasy stuff like bacon, cheese, and gravy. Your stomach may vary. Your best bet may be to start with an hour (25 km) a day and work your way up, trying different things and figuring out what works for your system.